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Finding the Fourth Proportional to 1,038.09, 1,556.18 and 388.38

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Solution

The fourth proportional to 1,038.09, 1,556.18 and 388.38 is: 582.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.09 : 1,556.18 = 388.38 : x
  2. Step 2: Convert to fraction form
    1,038.09/1,556.18 = 388.38/x
  3. Step 3: Cross multiply
    1,038.09x = 1,556.18 × 388.38
  4. Step 4: Simplify right side
    1,038.09x = 604,387.25
  5. Step 5: Solve for x
    x = 604,387.25/1,038.09
  6. Step 6: Final answer
    x = 582.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.